function autocomplete should read catalog from OCI annotation or Docker label

[yuwenma]

The function autocomplete catalog is hosted in https://catalog.kpt.dev/catalog-v2.json

The value is parsed from each function's metadata.yaml (see example) .

We should

1. change functions to store info in the OCI annotation or docker label once available
2. change the function autocomplete catalog to get metadata from OCI and docker accordingly.
3. Add --type=[m(utator)|v(alidator)] flag to kpt fn eval to filter corresponding type in auto completion and save to the corresponding kptfile once --save is used.

related to #2333

[yuwenma]

Per offline discussion, since kpt does not have short term plan to execute OCI KRM functions, we would not have autocomplete supporting the OCI annotation. Only add docker labels to the meta.